Abrader for disk-harrow blades.



W. D. BREMER.

ABRADER FOR DISK HARROW BLADES.

APPLICATION FILED AUG.26, I9Is.

1,172,763. Patented Feb. 22,1916.

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WILLIAM D. BREMER, OF GEDAR'FALLS, IOWA.

ABRADER FOR DISK-HARROW BLADES.

Specification of Letters Patent.

Patented Feb. 22, 1916.

Application filed August 26, 1915. Serial No. 47,479.

To all whom it may concern:

Be it known that I, WILLIAM B. BREMER, a citizen of the United States of America, and a resident of Cedar Falls, Blackhawk county, Iowa, have invented certain new and useful Improvements in Abraders for Disk- Harrow Blades, of which the followingis a specification.

My invention relates to improvements in abraders for disk-harrow blades, andthe object of my improvement is to furnish for such blades grinding-means movably and adjustably mounted adjacent to the blades, and adapted for convenient use in sharpening the blades at any time. This object I have accomplished by the means which are hereinafter described and claimed, and which are illustrated in the accompanying drawings, in which:

Figure 1 is a plan view of a disk-harrow equipped with my improved abraders. Fig. 2 is a detail side elevation of one of the rotary'blades, showing one of my abrading devices mounted in operative position rela- Fig. 3 is a detail view, enlarged, of the rocker-arm and abrader. Fig. 4 is a side elevation of the parts shown in said Fig. 3. Fig. 5 is a detail side elevation, showing a modified form of abrader and means for actuating it, mounted in grinding position against a rotaryblade.

Similar numerals of reference denote corresponding parts throughout the several views.

The concave-convex blades 16 are fixed on a rock-shaft 17, the latter mounted in bearings carried by arms 29 and 30, the latter adjustably secured to the harrowframe 27, with other braces 28 connecting said bearings and frame. An angle-bar 2 is fixed on arms whose lower ends are supported on said shaft, said angle-bar adapted to be adjustably connected to the frame 27 by means not shown,

Each blade 16 is supplied with an abrading-device adapted to be shifted into or out of grinding contact with the convex face of an adjacent blade 16 at and near its edge. This abrader consists of a block 1 1 of abrasive such as carborundum, removably held between two clamping-arms l2, adjustably mounted on the threaded arm 11, and held by the nuts 13. These clamps may be adjusted along the arm 11 to permit the abrader to be used on blades of different diameters. Each arm 11 is fixed on a rockbody 3, which latter has depending ends 15, orificed to be mounted to rock upon the shaft 1, and retained in place by collars 9 on the shaft, provided with SBteSCIBWSlO. Sleeves 8 are seated upon the shaft 1, and have projecting plates 4 with slots 5, whereby they may be adjustably mounted on the angle-bar 2 by means of bolts 6 and nuts 7.

An arm 18 is fixedly mounted on the rockshaft 1, and a rod 19 is connected between its upper end and a hand-lever 20 pivoted on a cross-bar of'the frame 27. A detent 2%, controlled by a spring 23, is connected to a rod 22, actuated by a fingenpiece 21 pivoted on said lever, and is adapted to engage either of two grooves 27 on a sectorrack 26 fixed on the cross-bar 25, whereby the abrader 14 may be brought into or out of grinding contact with the blade 16. when said arm 11 is rocked appropriately. By the said means, the blade may be re-sharpened at any time, when the harrow is in use.

Fig. 5 shows a modified form of the device. A rotatable abrader 39 is mounted between forks of a rock-arm 36, the latter hinged at to the angle-bar 2. The continued shaft of said abrader carries a sheave 40. A sheave 31 is fixed on the shaft 17, and a pair of idlers 33 are fixed on a common shaft rotatable in a bearing on said angle-bar 2. A belt or cable 32 connects the sheave 31 with one of said idlers, while another belt or cable 38 connects the other idler with the sheave 40. A rod 37 pivotally connected to the arm 36 serves to shift the abrader 39 into or out of grinding contact with the blade 16. The rotating shaft 17 of said blade thus rotates the abrader 39. Instead of sheaves and cables shown, sprocketwheels and chains may be employed.

Other modifications of my device may be employed without departing from the scope or principle of my invention.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is:

l. A disk-sharpening attachment for cultivators and the like, comprising a rockshaft, an arm fixed thereon, clamping-means on the end of said arm, a sharpening device held removably by said clamping-means, another arm fixed on said rock-shaft, a lever, and a linking-connection between said lever and the second-mentioned arm. 1 e

2. A disk-sharpening attachment for cultivators and the like, comprising a rockshaft, an arm fixed thereon, clamping-means adjustable longitudinally on said arm, a sharpening device held releasably by said rclamping-means, and means for rocking adjustably mounted on said arm, sharpening-means releasably held by said clamping:

means, and means for rocking said shaft to 15 bring said sharpening device into or out of contact With a disk.

Signed at Cedar Falls, Iowa, this 7th day of August, 1915.

WILLIAM D. BREMER.

-Witnesses HENRY G. REIHER, ORLIN R. BREMER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

